package com.itheima.reggie.controller;


import com.itheima.reggie.common.R;
import com.itheima.reggie.exception.BusinessException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;


@RestController
@RequestMapping("common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;


    /**
     * 文件上传
     * @param file
     * @return
     */
    @RequestMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info(file.toString());

        //获取原始文件名
        String originalFilename = file.getOriginalFilename();
        //截取后缀名
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID重新生成文件名
        String filename = UUID.randomUUID() + suffix;

        //创建一个目录对象
        File dir = new File(basePath);
        if (!dir.exists()){
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(basePath+filename));
        } catch (IOException e) {
            e.printStackTrace();
        }

        return R.success(filename);

    }


    @GetMapping("/download")
    public void download(String name, HttpServletResponse response)  {
        //获取输入流，读取服务器存储的图片
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //获取输出流，把图片写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            //?
            response.setContentType("image/jpeg");
            int len=0;
            byte[] bytes = new byte[1024 * 8];
            while((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (IOException e) {
            //运行时异常
            e.printStackTrace();
        }

    }
}
